Half to william h



(No Modem 2 sheees-sneee 1 J. P. SIMMONS.

GUT-OPF VALVE.

No. 305,718. Patented Sept. 23, 1884.

rnTnn TATns; ATnNT trice.

JOHN P. SIMMONS,OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONF- HALF TO VILLIAM H. OHMEN, OF SAME PLACE.

CUT-OFF VALVE.

uSPE?CIFICA'IION forming part of Letters Patent No. 305,718, dated September 23, .1884. l Application filed October 20, 18%. (No model.)

To all whom, if; may concern:

Beit known that I, JOHN l?. SrMMoNs, of the city and county of San Francisco, and State or" chest, and an interior concentrically-plaoed l cut-off valve, also rotating, so as to limit the admission of steam.

Referring to the accompanying drawingsfor a more complete explanation of my invention, Figure l is a transverse section of the steamehcst and valves taken through .c x, Fig. 3. Fig. 2 is a section taken through g/ y, Fig. 3. Fig. 3 is a longitudinal vertical section taken through the steam-chest and valves. Fig. 4 shows the steam-port outside and the exhaustport in the center. Fig. 5 shows the cut-off valve omitted.

A is the steam-chest, its interior being of the shape of a frustum of a cone of considerable length, having an extension or sleeve, B, through which the stems pass to move the :main and cut-off valves.

C is a passa-ge or port through which steam is admitted into the steam-chest; and D is the exhaust-passage through which the steam escapes when released from the cylinder. The main valve E fits the interior tapering form of the steain-chest, forming a steam-tight working-surface between the two, and it has a passage, F, communicating With the steam-passage C in the chest, so that steam may be admitted into its interior. NVithi n the main valve is tted the cut-oil" valve C, its exterior surface fitting within the tapering interior of the main valve, in the same manner that the main valve iits into the steam-chest, and the surfaces work together steam-tight.

H is a passage through the cutoff-valve shell, communicating with the passage C and F in the steam-chest and main valve, so that steam may be admitted through them into the 5c interior of the cut-'off valve.

I is a space or passage around the outside with the interior of the steam-chest.

K is a port through the main valve, and K is a port through the cut-orf valve, through 6o which steam passes from the interior of the latter valve to the engine-cylinder through the ports J J alternately when the ports K and K are brought to coincide with them. Each of the valves E and` G are given a rotary oscillation by means of eccent'rics, which are connected by rods with rocker-arms L L. The main valve E has a hollow stem or sleeve, M, which extends out through the extension B of the steam-chest, and the rocker-arm L is se- 7o cured to it. The stem VN of the cnt-off valve extends out through the hollow sleeve M, and has the arm L keyed to it. Collars O O are fitted around the stems M and N, and between the ends of the valves and the inner ends of 75,

`the chambers within which they oscillate, to

prevent .their beingA forced too far in. The opposite or outer end of the steam chest or case may have a cover which closes it. Theoperation will then be as follows The ec- 8o centrics are set so that when the engine moves the main valve is turned until its port K coincides with one of the cylinder -ports J. The cut-off valve is moved simultaneously, so that its port K is in advance of the port K of the main valve, and does not allow any steam from the interior ofthe cut-off valve (which is supplied from the port C) to enter the cylinder. When the port K opens into the port J the cut-oit' valve begins to move in an opposite 9o direction, and admits steam through the ports K, K,and J as long as the three coincide. rlhe backward movement of the cut-ott` valve, however, soon `cuts off the steam from the port K in the main v`alve,and the two valves then con- 95,

tiuue to traverse theremainder of their arc until the port K of the main valve coincides with the port J for the opposite end of the cylinder. y rlhe return movement of the cut-off valve ad,- mits steam to the cylinder while the ports coroo incide, as above described.

It will be manifest that the cut-ott valve can be removed or omitted, and thc engine -willthen take steaniand runlikean ordinary singlelnainvalve engine, as in Fig. 7. The passages I around the exteriorrof the main valve are alternately brought opposite the ports J, so that steam exhausts through them while the opposite. end of the cylinder is receiving steam.

n fitting concentrically Within one another,with l" In order to make my cut-off' adjustable and automatic, the eccentric by which it is actuated is shifted by a gover1ior,\vliich forms the subject matter of another application, filed May 23, 1884, Serial No. 132,573. If the engine runs more slowly, the eccentric is moved in an opposite direction upon .the`shaft, and thus regulates the position ofthe cut-off valve.

Having thus described my invention,whatI claim as new, and desire to secure by Letters Patent, is-

1. The combination of a rotary main valve and a cut-off valve, both closed at one end and a steam-chest having inlet and outlet ports arranged on the same side, substantially as speci-v fied.

2. The combination of a rotary main valve Hand cut-orf valve, both closed at one end and provided With inlet and outletports,as shown, with a steanrcheSt, substantially as set forth.

3. The combination of a rotary main valve and cut-off valve, both closed at the reduced end and provided with inlet and outlet ports, as

I shown, said 'main valve having an elongation l through which the valve-stem ol' the cut-oll` valve passes,with a steam-chest, all arranged for operation substantially as specified.

4; The combination of a rotary valve and a cut-off v'alve constructed as shown, and said main valve provided with an elongation, through which the .valve-stem of the cut-off passes, and both fitting concentrically into each other and into a steam-chest, with the collars O O, as and for the purpose set forth.

5. A rotary main valve and a cut-off valve fitting concentrically into each other and into a steam-chest, and said valves having portsK K and F H, and a passage, I, in combination with. a steam-chest having inlet-passage C and exhaust-passage D, both arranged on the same side, vand said valves provided with means for operating them, substantially as specified.

l 6. The combination of a rotary cut-off valve,

G, and a main valve, E, both closed at the re-- y duced end and fitting concentrically into each other and into a steani-chest,'all provided with ports and passages, as shown, and having an extension, B, through which a sleeve, M,passes for the valve-stem N, and 4arranged for operation as and for the purpose specified.

In Witness whereof I have hereunto set my hand.

JOHN` P. SIMMONS. Vitnesses:

S. H.'Nounsn, H. C. LEE. 

